《Table 1 Fluorescence intensity of GOSs/ (Sm-Gd) BA3Phen》

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The emission spectra of GOSs/（Sm-Gd）BA3Phen complex hybrid with different Gd3+or Sm3+molar ratios under excitation 352 nm has been showed in Fig.8.Table 1 shows the result of the excitation and emission intensity，where Ixis the measured fluorescence excitation intensity and Imis the measured fluorescence emission intensity of complex hybrid.In order to further study the relationship between fluorescent intensity and the concentration of Gd3+，more analyses were carried out.As we can see in Fig.8，all the emission spectra were similar and had the characteristic peaks of Sm3+.Fig.8（b）shows the different Gd3+molar fractions under the wavelength of 596 nm.It could also be seen from the Table 1 that when the amount of Gd3+or Sm3+reached the maximum，the fluorescence intensity of the hybrid was the weakest.The most suitable conditions was obtained through different molar ratios.The intensity reached maximum when nSm3+∶nGd3+was 5∶5.It may be due to the energy transfer from Gd3+to Sm3+enhancing the fluorescence performance of the complex hybrids，but excess Gd3+or Sm3+will quench the fluorescence performance.